Results 61 to 70 of about 96 (81)

Stellar Variability toward the Galactic Open Cluster NGC 7209

The Astrophysical Journal
We present the analysis of stellar variability in an open cluster NGC 7209 using optical V -band CCD photometric observations. Out of 4499 stars in our study, we detected 284 candidate variables, including one identified previously.
Dorothy M. Mwanzia, Sneh Lata, W. P. Chen, Soumen Mondal, Geoffrey Okeng’o, John Buers, Samrat Ghosh, Athul Dileep, Arjav Jain, Alisher S. Hojaev, Santosh Joshi   +10 more
doaj   +1 more source

Resolving Pleiades Binary Stars with Gaia and Speckle Interferometric Observations

The Astronomical Journal
The Pleiades is the most prominent open star cluster visible from Earth and an important benchmark for simple stellar populations unified by common origin, age, and distance.
Dmitry Chulkov, Ivan Strakhov, Boris Safonov   +2 more
doaj   +1 more source

A Close Binary Lens Revealed by the Microlensing Event Gaia20bof

The Astronomical Journal
During the last 25 yr, hundreds of binary stars and planets have been discovered toward the Galactic bulge by microlensing surveys. Thanks to a new generation of large-sky surveys, it is now possible to regularly detect microlensing events across the ...
E. Bachelet, P. Rota, V. Bozza, P. Zieliński, Y. Tsapras, M. Hundertmark, J. Wambsganss, Ł. Wyrzykowski, P. J. Mikołajczyk, R. A. Street, R. Figuera Jaimes, A. Cassan, M. Dominik, D. A. H. Buckley, S. Awiphan, N. Nakhaharutai, S. Zola, K. A. Rybicki, M. Gromadzki, K. Howil, N. Ihanec, M. Jabłońska, K. Kruszyńska, K. Kruszyńska, U. Pylypenko, M. Ratajczak, M. Sitek, M. Rabus   +27 more
doaj   +1 more source

ICCD Speckle Observations of Binary Stars. XIX. An Astrometric/Spectroscopic Survey of O Stars [PDF]

, 1998
Brian D. Mason, Douglas R. Gies, William I. Hartkopf, W. G. Bagnuolo, Theo A. ten Brummelaar, Harold A. McAlister   +5 more
openalex   +1 more source

High-resolution Imaging of a TESS Control Sample: Verifying a Deficit of Close-in Stellar Companions to Exoplanet Host Stars

The Astronomical Journal
The large number of exoplanets discovered with the Transiting Exoplanet Survey Satellite (TESS) means that any observational biases from TESS could influence the derived stellar multiplicity statistics of exoplanet host stars. To investigate this problem,
Colin Littlefield, Steve B. Howell, David R. Ciardi, Kathryn V. Lester, Mark E. Everett, Elise Furlan, Rachel A. Matson, Sergio B. Fajardo-Acosta, Crystal L. Gnilka   +8 more
doaj   +1 more source

Closeby Habitable Exoplanet Survey (CHES). III. Retrieval of Planetary Masses in Binaries Using the N-body Model with Radial Velocity and Astrometry Synergy

The Astrophysical Journal
Given that secular perturbations in a binary system not only excite high orbital eccentricities but also alter the planetary orbital inclination, the classical Keplerian orbital model is no longer applicable for orbital retrieval.
Xiumin Huang, Jianghui Ji, Chunhui Bao, Dongjie Tan, Su Wang, Yao Dong, Guo Chen   +6 more
doaj   +1 more source

OGLE-2011-BLG-0462: An Isolated Stellar-mass Black Hole Confirmed Using New HST Astrometry and Updated Photometry

The Astrophysical Journal
The long-duration Galactic-bulge microlensing event OGLE-2011-BLG-0462 produced relativistic astrometric deflections of the source star, which we measured using Hubble Space Telescope (HST) observations taken at eight epochs over ∼6 yr.
Kailash C. Sahu, Jay Anderson, Stefano Casertano, Howard E. Bond, Martin Dominik, Annalisa Calamida, Andrea Bellini, Thomas M. Brown, Henry C. Ferguson, Marina Rejkuba   +9 more
doaj   +1 more source

Ba Enrichment in Gaia MS+WD Binaries: Tracing s-process Element Production

The Astrophysical Journal Letters
A large population of intermediate-separation binaries, consisting of a main-sequence (MS) star and a white dwarf (WD), recently emerged from Gaia’s third data release (DR3), posing challenges to current models of binary evolution. Here we examine the s -
Param Rekhi, Sagi Ben-Ami, Na’ama Hallakoun, Sahar Shahaf, Silvia Toonen, Hans-Walter Rix   +5 more
doaj   +1 more source

Astrometric and photometric measurements of binary stars with adaptive optics: observations from 2001 to 2006 [PDF]

, 2017
Lewis C. Roberts, Brian D. Mason
openalex   +1 more source

Hidden Companions to Intermediate-mass Stars. XIX. Spin–Orbit Misalignment and a 0.26M _⊙, 1.8 au Companion in the Astrometric Binary Gamma Trianguli Australis* [PDF]

Idel Waisberg, Ygal Klein, Boaz Katz
openalex   +1 more source